当你从一个文件中打开一个数据后，它的波段被存储在一个列表中，通过它你可使用系统的所有功能。

When you open a data input file, its bands are stored in a list where you can access them from all system functions.

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可能你电脑上已经有一个恢复的映像文件，但是它除占用你的磁盘空间，还有可能误删或是安装系统被格式化掉了。

There has been a recovery image file on your computer, but it in addition to occupying space on your disk, there may accidentally deleted or installation of the system has been formatted off.

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